JPH04270610A - 複合材料を圧密化するクロスオ―バ―成形用具 - Google Patents
複合材料を圧密化するクロスオ―バ―成形用具Info
- Publication number
- JPH04270610A JPH04270610A JP2411586A JP41158690A JPH04270610A JP H04270610 A JPH04270610 A JP H04270610A JP 2411586 A JP2411586 A JP 2411586A JP 41158690 A JP41158690 A JP 41158690A JP H04270610 A JPH04270610 A JP H04270610A
- Authority
- JP
- Japan
- Prior art keywords
- composite material
- composite
- region
- pressure
- consolidation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 219
- 230000019681 resolution of meiotic recombination intermediates Effects 0.000 title 1
- 239000012528 membrane Substances 0.000 claims abstract description 89
- 238000007596 consolidation process Methods 0.000 claims description 69
- 238000000034 method Methods 0.000 claims description 54
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 21
- 238000003825 pressing Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000005056 compaction Methods 0.000 claims description 12
- 239000012783 reinforcing fiber Substances 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000007704 transition Effects 0.000 abstract description 5
- 230000007547 defect Effects 0.000 description 18
- 239000011159 matrix material Substances 0.000 description 12
- 229920001721 polyimide Polymers 0.000 description 7
- 239000004642 Polyimide Substances 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000037303 wrinkles Effects 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000002759 woven fabric Substances 0.000 description 3
- 241000239290 Araneae Species 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920002449 FKM Polymers 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- -1 whiskers Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/025—Bending or folding using a folding bag
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
- B29C57/005—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels the end of an internal lining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0227—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using pressure vessels, e.g. autoclaves, vulcanising pans
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
- B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
- B29K2105/243—Partially cured
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Forging (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/512,225 US5145621A (en) | 1990-04-20 | 1990-04-20 | Crossover mold tool for consolidating composite material |
US512,225 | 1990-04-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04270610A true JPH04270610A (ja) | 1992-09-28 |
Family
ID=24038207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2411586A Pending JPH04270610A (ja) | 1990-04-20 | 1990-12-19 | 複合材料を圧密化するクロスオ―バ―成形用具 |
Country Status (7)
Country | Link |
---|---|
US (1) | US5145621A (fr) |
JP (1) | JPH04270610A (fr) |
CA (1) | CA2038214A1 (fr) |
DE (1) | DE4040746A1 (fr) |
FR (1) | FR2661128A1 (fr) |
GB (1) | GB2243104B (fr) |
IT (1) | IT1243497B (fr) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006175866A (ja) * | 2004-12-22 | 2006-07-06 | General Electric Co <Ge> | 強化マトリクス複合材部品を形成するための型ツール |
JP2009274248A (ja) * | 2008-05-13 | 2009-11-26 | Toray Ind Inc | Frpの製造方法 |
JP2014504564A (ja) * | 2011-01-03 | 2014-02-24 | ザ・ボーイング・カンパニー | 複合材半径部を圧縮する方法および装置 |
JP2015182467A (ja) * | 2014-03-21 | 2015-10-22 | ゼネラル・エレクトリック・カンパニイ | 構成要素上にフランジを形成する装置および方法 |
JP2017114120A (ja) * | 2015-12-25 | 2017-06-29 | 翁慶隆 | 複合材料チューブの作製方法とその装置 |
Families Citing this family (44)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5597435A (en) * | 1992-12-24 | 1997-01-28 | General Electric Company | Method using restrained cauls for composite molding |
US5348602A (en) * | 1993-06-08 | 1994-09-20 | General Electric Company | Method for making a bonded laminated article bend portion |
DE4325488A1 (de) * | 1993-07-29 | 1995-02-02 | Herbert K F Dipl Ing D Boerger | Verfahren zur Herstellung eines Formteils aus thermoplastischem Kunststoff |
US5447668A (en) * | 1993-10-04 | 1995-09-05 | Rockwell International Corporation | Method and apparatus for eliminating fiber distortions and separations in metal matrix materials |
US5520532A (en) * | 1994-08-01 | 1996-05-28 | United Technologies Corporation | Molding assembly for forming airfoil structures |
GB2300138A (en) * | 1995-04-21 | 1996-10-30 | Fluorovac Ltd | Seal arrangement in vacuum bagging moulding |
US5648109A (en) * | 1995-05-03 | 1997-07-15 | Massachusetts Institute Of Technology | Apparatus for diaphragm forming |
US5641525A (en) * | 1995-09-11 | 1997-06-24 | Outboard Marine Corporation | Resin transfer molding apparatus |
GB9828368D0 (en) * | 1998-12-22 | 1999-02-17 | British Aerospace | Forming reinforcing components |
DE19903681A1 (de) * | 1999-01-29 | 2000-08-03 | Sika Ag, Vormals Kaspar Winkler & Co | Verfahren zur Herstellung von aus Flachbandlamellen bestehenden winkelförmigen Bauteilen |
DE60022957T2 (de) * | 1999-08-04 | 2006-07-20 | Conception Et Development Michelin S.A. | Verfahren zur Herstellung von hochbeanspruchten Verbundteilen |
GB2364266B (en) * | 2000-07-04 | 2004-04-28 | Kevin John Channer | Improvements in and relating to the moulding of composite materials |
EP1174250B1 (fr) * | 2000-07-17 | 2005-10-19 | Conception et Développement Michelin S.A. | Imprégnation en continu de fibres en grandes longueurs, par de la résine, pour la fabrication d'éléments composites longilignes |
US7332049B2 (en) * | 2004-12-22 | 2008-02-19 | General Electric Company | Method for fabricating reinforced composite materials |
US7431978B2 (en) | 2004-12-22 | 2008-10-07 | General Electric Company | Reinforced matrix composite containment duct |
EP1775109B1 (fr) | 2005-10-17 | 2011-03-09 | Saab Ab | Procédé et dispositif de moulage d'articles composites avec un sac sous vide |
GB0613872D0 (en) * | 2006-07-12 | 2006-08-23 | Airbus Uk Ltd | Method of manufacturing composite part |
US20080115339A1 (en) * | 2006-11-21 | 2008-05-22 | Lee Alan Blanton | Apparatus for use with structures having mounting flanges |
US20080116334A1 (en) * | 2006-11-21 | 2008-05-22 | Ming Xie | Methods for fabricating composite structures having mounting flanges |
US8021102B2 (en) * | 2006-11-30 | 2011-09-20 | General Electric Company | Composite fan containment case and methods of fabricating the same |
US20080210372A1 (en) * | 2007-03-01 | 2008-09-04 | Cumings Robert C | Composite article debulking process |
US8382924B2 (en) | 2007-11-26 | 2013-02-26 | Textron Innovations Inc. | Multi-stage debulk and compaction of thick composite repair laminates |
EP2116358B1 (fr) * | 2008-05-09 | 2016-06-29 | Saab Ab | Méthode et outillage de mise en forme d'un flanc |
US8585952B2 (en) * | 2009-06-12 | 2013-11-19 | Alliant Techsystems Inc. | Pressure molded preform process for composite structures |
FR2961740B1 (fr) * | 2010-06-25 | 2014-03-07 | Snecma | Procede de fabrication d'un article en materiau composite |
US9144944B1 (en) * | 2010-09-09 | 2015-09-29 | Groen Brothers Aviation, Inc. | Rotor blade spar manufacturing apparatus and method |
US8403016B2 (en) | 2011-08-05 | 2013-03-26 | Kevin Snyder | Mandrel with sliding exterior projection |
EP2771174B1 (fr) * | 2011-10-26 | 2015-12-16 | Snecma | Mandrin d'impregnation a bache vide pour la fabrication d'un carter de turbine a gaz en materiau composite |
FR2987779A1 (fr) * | 2012-03-12 | 2013-09-13 | Airbus Operations Sas | Procede de realisation d'une piece en materiau composite et outillage pour sa mise en oeuvre |
FR2987781B1 (fr) * | 2012-03-12 | 2014-04-11 | Airbus Operations Sas | Procede d'obtention d'une piece en materiau composite incorporant une phase de mise en tension des filaments et outillage pour sa mise en oeuvre |
ES2432090B2 (es) * | 2012-03-26 | 2015-04-27 | Airbus Operations, S.L. | Procedimiento de fabricación de piezas realizadas en material compuesto y dispositivo empleado. |
FR2995244B1 (fr) * | 2012-09-07 | 2014-10-10 | Airbus Operations Sas | Procede de realisation d'un profile en materiau composite presentant un angle rentrant a partir d'un empilage de couches de fibres |
US9573301B2 (en) | 2013-03-19 | 2017-02-21 | The Boeing Company | Methodfor reducing ply wrinkling of composite laminates during forming |
US10150233B2 (en) * | 2013-03-19 | 2018-12-11 | The Boeing Company | Method and apparatus for reducing ply wrinkling of composite laminates during forming |
JP6216134B2 (ja) * | 2013-03-28 | 2017-10-18 | 三菱航空機株式会社 | 繊維強化プラスチック部材の成形装置および成形方法 |
DE102015102437B4 (de) * | 2014-02-20 | 2021-02-04 | East-4D Carbon Technology Gmbh | Verfahren zur Herstellung einer Verstärkung für Flanschstrukturen aus Faserverbundwerkstoff |
GB201507414D0 (en) | 2015-04-30 | 2015-06-17 | Composite Technology & Applic Ltd | A method of Manufacturing a Composite Component |
DE102015117857A1 (de) | 2015-10-20 | 2017-04-20 | Siempelkamp Maschinen- Und Anlagenbau Gmbh | Verfahren zum Herstellen eines Bauteils aus einem Faserverbundwerkstoff |
DE102016101631A1 (de) | 2016-01-29 | 2017-08-03 | Siempelkamp Maschinen- Und Anlagenbau Gmbh | Presse zum Herstellen eines Bauteils aus einem Faserverbundwerkstoff |
DE102016101641A1 (de) | 2016-01-29 | 2017-08-03 | Siempelkamp Maschinen- Und Anlagenbau Gmbh | Verfahren und Presse zum Herstellen eines Bauteils aus einem Faserverbundwerkstoff |
DE102016101638A1 (de) | 2016-01-29 | 2017-08-03 | Siempelkamp Maschinen- Und Anlagenbau Gmbh | Presse zum Herstellen eines Bauteils aus einem Faserverbundwerkstoff |
US10953575B2 (en) * | 2016-02-12 | 2021-03-23 | The Boeing Company | Enhanced systems that facilitate vacuum bag curing of composite parts |
US10974467B2 (en) | 2016-02-12 | 2021-04-13 | The Boeing Company | Enhanced systems that facilitate vacuum bag curing of composite parts |
FR3089855B1 (fr) * | 2018-12-14 | 2022-01-14 | Safran | Moule de cuisson pour fabriquer une piece de turbomachine en materiau composite a partir d’une preforme, procede de fabrication d’une piece au moyen d’un tel moule et piece obtenue par un tel procede |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB848608A (en) * | 1957-09-25 | 1960-09-21 | Du Pont | Method of making laminated structures |
DE1102626B (de) * | 1959-10-21 | 1961-03-16 | Italtubi S P Az Soc Riunite G | Verfahren und Vorrichtung zum Herstellen von Hohlkoerpern aus Asbestzement od. dgl. formbarem Material mit nach aussen vorspringenden, massiven Wandungsteilen |
GB959360A (en) * | 1962-12-20 | 1964-06-03 | Studebaker Corp | Articles having resin-impregnated walls |
GB1582038A (en) * | 1976-09-08 | 1980-12-31 | Resistoflex Corp | Tool and method for forming a flange on plastics turbing |
GB2065022A (en) * | 1979-12-08 | 1981-06-24 | British Aerospace | Apparatus and method for forming and curing |
IT1126638B (it) * | 1979-12-20 | 1986-05-21 | Pier Luigi Nava | Procedimento e relativo utensile per stampare manufatti in resina armata |
JPS60139433A (ja) * | 1983-12-28 | 1985-07-24 | Toshiba Corp | 繊維強化プラスチツク製中空体の成形方法 |
GB8423580D0 (en) * | 1984-09-18 | 1984-10-24 | Aerovac Systems Keighley Ltd | Vacuum bagging |
GB2168002B (en) * | 1984-12-06 | 1988-06-08 | Rolls Royce | Composite material manufacture |
US4816106A (en) * | 1984-12-13 | 1989-03-28 | Aeritalia Saipa - Gruppo Velivoli Da Trasporto | Method for the controlled curing of composites |
GB2184053B (en) * | 1985-12-12 | 1989-10-18 | Rolls Royce | Method of manufacturing an article form a fibre reinforced composite material |
US4842670A (en) * | 1986-03-07 | 1989-06-27 | Northrop Corporation | Molded vacuum bag for debulking and autoclaving laminates of complex shapes |
-
1990
- 1990-04-20 US US07/512,225 patent/US5145621A/en not_active Expired - Lifetime
- 1990-12-12 FR FR9015582A patent/FR2661128A1/fr not_active Withdrawn
- 1990-12-19 JP JP2411586A patent/JPH04270610A/ja active Pending
- 1990-12-19 DE DE4040746A patent/DE4040746A1/de active Granted
- 1990-12-19 GB GB9027562A patent/GB2243104B/en not_active Expired - Fee Related
- 1990-12-20 IT IT02246690A patent/IT1243497B/it active IP Right Grant
-
1991
- 1991-03-14 CA CA002038214A patent/CA2038214A1/fr not_active Abandoned
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006175866A (ja) * | 2004-12-22 | 2006-07-06 | General Electric Co <Ge> | 強化マトリクス複合材部品を形成するための型ツール |
JP2009274248A (ja) * | 2008-05-13 | 2009-11-26 | Toray Ind Inc | Frpの製造方法 |
JP2014504564A (ja) * | 2011-01-03 | 2014-02-24 | ザ・ボーイング・カンパニー | 複合材半径部を圧縮する方法および装置 |
US9427899B2 (en) | 2011-01-03 | 2016-08-30 | The Boeing Company | Device for compressing a composite radius |
JP2015182467A (ja) * | 2014-03-21 | 2015-10-22 | ゼネラル・エレクトリック・カンパニイ | 構成要素上にフランジを形成する装置および方法 |
JP2017114120A (ja) * | 2015-12-25 | 2017-06-29 | 翁慶隆 | 複合材料チューブの作製方法とその装置 |
Also Published As
Publication number | Publication date |
---|---|
GB9027562D0 (en) | 1991-02-06 |
GB2243104B (en) | 1993-11-17 |
IT1243497B (it) | 1994-06-15 |
FR2661128A1 (fr) | 1991-10-25 |
DE4040746A1 (de) | 1991-10-24 |
GB2243104A (en) | 1991-10-23 |
IT9022466A0 (it) | 1990-12-20 |
US5145621A (en) | 1992-09-08 |
DE4040746C2 (fr) | 1992-12-03 |
CA2038214A1 (fr) | 1991-10-21 |
IT9022466A1 (it) | 1991-10-21 |
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